The news on Wednesday that cities and states are suing some of the world's largest banks over Libor manipulation shows how this scandal could blow up into one of history's biggest bank frauds.

That's because interest-rate manipulation might well have kept your town or state from hiring firefighters or teachers, from paving roads or paying for indigent care or after-school programs for your kids -- adding to the human suffering of the economic collapse these same banks caused in the first place.